Independent Cooperative Campaign Worlds

I haven’t seen a suggestion for this yet to my knowledge, but what I envision is a singular world, played by multiple accounts. Franz would track each account independently and do actions with them independently but the accounts could intersect with eachother. Say Player A does a mention of Player B then they link together for interactions and then when they go their separate ways then they act independently again. The world itself would be tracked as one entity with actions taken being reflected in both people’s play sessions which would give a true lived in feel while allowing each player to feel autonomous without being leashed to eachother.